Rock drill insert

US12098447B2 · kind B2 · utility

Assignee

• Sandvik Mining and Construction Tools AB · SE

Inventors

• Mirjam Lilja · Stockholm, SE
• Jose Maria Tarrago Cifre · Barcelona, ES
• Ida BORGH · Abrahamsby, SE
• Malin Mårtensson · Borås, SE
• Ioannis ARVANITIDIS · Älta, SE
• Krystof Turba · Nynäshamn, SE

Key dates

• Filing date: Mar 22, 2019
• Grant date: Sep 24, 2024
• Expiry date: May 28, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/96
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A rock drill insert made of cemented carbide includes hard constituents of tungsten carbide (WC) in a binder phase of Ni—Cr, or Ni—Co—Cr, and a balance of WC and unavoidable impurities. The cemented carbide has a 3.5-18 wt % binder phase. The binder phase has >0 wt % Ni. The mass ratio Cr/(Ni+Co) is 0.02-0.19. A difference between the hardness at 0.3 mm depth at some point of the surface of the rock drill insert and the minimum hardness of the bulk of the rock drill insert is at least 30 HV3.